Install cross-rs from git + update dependencies.

The latest cross-rs release (0.2.5) does not work with the latest Rust
release, until a new release is out we need to install from git.

There is still an issue when compiling for mips, which will be
resolved when a new libc crate release is out:
rust-lang/libc#4354

Author: brocaar

.github/workflows/main.yml

@@ -65,6 +65,9 @@ jobs:
             ~/.cargo/git/db/
             target/
           key: ${{ runner.os }}-cargo-dist-${{ matrix.target }}-${{ hashFiles('**/Cargo.lock') }}
+      -
+        name: Install dev dependencies
+        run: nix-shell --command "make dev-dependencies"
       -
         name: Build distributables
         run: nix-shell --command "make dist-${{ matrix.target }}"